Malicious PDF — malware analysis report

Static analysis result for SHA-256 368f22c93a09fa1a…

MALICIOUS

PDF

80.8 KB Created: 2021-03-28 09:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f5ada920f8dc8f5976a2e16df70789 SHA-1: 6fdb93ef24578ec4aff940416f069f05b2b7384f SHA-256: 368f22c93a09fa1a57eaa250124a0056798c191d2bf7604cfcd47b4131a542a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The document body, though heavily corrupted, contains text related to a book search, aligning with the external URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/wix?keyword=biopsychology+pinel+9th+edition+pdf+free
    • http://mnatural.space/56820861752sanhn.pdf
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/4523443.pdf
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/towuduz.pdf
    • http://servicesforsupport.com/ferunamec390i.pdf
    • http://ig-socialmedia.xyz/prayer_rain_dr_olukoyayvxuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rigutogivopum.epizy.com/reformed_baptist_church_melbourne_fl.pdf
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_f70acd2c226a418c9494a677559458aa.pdf?index=true
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_e61825ad0eb94e998b90d97643c0732f.pdf?index=true
    • http://wepilige.epizy.com/1971428758.pdf
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_af4dd62288b3400eb4bff887ecaac848.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_6d0d18ca31a94003a3ba7c861d1b3c70.pdf?index=true
    • http://tupusivamiguta.rf.gd/flyer_ppt_template.pdf
    • https://uploads.strikinglycdn.com/files/b81f0579-6f9a-4d11-8a3b-6126e4e77130/51478863069.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_33bdd4bc33ac4f1fbe2504112118e88a.pdf?index=true
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_95e6a4c4f89e47849a236e5b1d07e6db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45a58a21-6fec-4881-a6ee-13cb17d4c2d4/9822824402.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_24b0866b46fc4d218995554bda6f162c.pdf?index=true
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_60a05fc77f954ef897c4117213e20735.pdf?index=true
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_2137c62928a24d6a87dea8a68bb09b1c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ac.bin
09f0150912b3d43bb5c8ecc8da34b72c27258801c81f0b71f27ec633d555402a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 5512 bytes
font_01_sfnt_off00010470.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 1800 bytes
font_02_sfnt_off00010cfe.bin
9d8b6bdb94dd98f3eb2f39f3f782fdb3e28b43211132e7adfc1942a9e869be39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 11500 bytes

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